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Derivative Financial Instruments (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Maximum net exposure to counterparty                 $ 947    
Sales $ 52,677 $ 45,774 $ 30,680 $ 41,556 $ 41,399 $ 39,441 $ 29,142 $ 38,207 170,687 $ 148,189 $ 155,266
Other, net                 343 533 $ 434
Reclassification Out Of Accumulated Other Comprehensive Income [Member]                      
Sales                 (450) (351)  
Other, net                   $ (42)  
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Cash Flow Hedges [Member]                      
Sales                 $ (450)